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Poster: Administrator, Curator, or StaffCR Saikley Date: Mar 22, 2005 2:58pm
Forum: petabox Subject: Re: Drive spin-down? Low-RPM drives? Power saving?

Low power modes already exist for the drives we use. For a description, see:

http://www.hitachigst.com/tech/techlib.nsf/techdocs/EBB67181ACB207C586256D340075B4DF/$file/WP_PowerAcoustic_25March.pdf

The performance hit is that you can't read or write until the disk is back to its normal operating state, and the associated recovery time ranges from 0.7-15 seconds depending on the mode used.

The most power-conservative modes entail too long a recovery time to be used across all machines, but could be used on backup drives.

This post was modified by CR Saikley on 2005-03-22 22:58:16

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Poster: HDRJapan Date: Oct 3, 2007 6:14pm
Forum: petabox Subject: Re: Drive spin-down? Low-RPM drives? Power saving?

Is it not true that the more the drive is tagged that the longer the recovery becomes? We have a similar situation with a expired domain search engine at http://www.findeteer.com in which where the drives have a recovery speed unless the drive keeps getting queried.

We have set it so that no matter what the query rate that the system recovers before it accepts the next query in line.

The only drawback is that when the visitor query rate is high the system seems to slow down and even stop at times because of using this methodology. But this solves drive crashes.

We had to do this because a query may look at 10 million domains to shoot out the results.

James
http://www.hdrjapan.com